Remove X11 and GTK dependencies from host_forwarder

Use libevent as the implementation of MessagePumpForUI.

BUG=346113

Review URL: https://codereview.chromium.org/176713005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257853 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: f4440b4eee412f2d3073967487fd32d4f95d43a9
diff --git a/base/message_loop/message_loop.h b/base/message_loop/message_loop.h
index 400a5ec..e52963f 100644
--- a/base/message_loop/message_loop.h
+++ b/base/message_loop/message_loop.h
@@ -38,7 +38,7 @@
 #include "base/message_loop/message_pump_x11.h"
 #elif defined(USE_OZONE) && !defined(OS_NACL)
 #include "base/message_loop/message_pump_ozone.h"
-#else
+#elif !defined(OS_ANDROID_HOST)
 #define USE_GTK_MESSAGE_PUMP
 #include "base/message_loop/message_pump_gtk.h"
 #if defined(TOOLKIT_GTK)
@@ -57,6 +57,8 @@
 class ThreadTaskRunnerHandle;
 #if defined(OS_ANDROID)
 class MessagePumpForUI;
+#elif defined(OS_ANDROID_HOST)
+typedef MessagePumpLibevent MessagePumpForUI;
 #endif
 class WaitableEvent;